Pneumatic tool.



` G. BRIEGEL.

PNEUMATIG TOOL.

APPLIOATION FILED Nov. v, 191s.

1, 105,876; yPanenmmug. '4, 1914.

15u/enfon- Wzesses:

. 1Q 60m@ gaga.

fm j

titi

, the piston from inarrEn sfra'rEs PATENT oEiuoE.

GCT'lLlFiB BRIEGEL, OF FOND DU LAC, WISCONSIN.

PNEUMATIC Toon.

Monete..

T all whomit may concern:

Be it known that I, Gofrriann ljmnonn, a citizen of the United States, residingI at Fond du Lac, in the county of Fond du Lac and, State ot' Wisconsin, have invented certain new anduseful Improvements in 'Pneumatic Tools, of which thefollowing iS his invention relates to the class ol. pneumatic implements that comprises a re- 'eipincatory piston Aacting upon a rivet set or other tool for transmitting the blows'of the piston to the article` operated upon, and :relers particilarl to means for preventing ing discharged from the barrel of the implement. 'i 4.

ln pneumatic implements` wherein the shank ot the tool is of smaller diameter than the piston, the piston cannot,'of course, he discharged through the bore in whichthe tool shank is slidably mounted; but in the case of implements wherein the shankof the tool is ot' larger diameter thanl the piston i.

(as in pneumatic riveters and, other powertul pneumatic implements) no means has ever been provided to prevent the piston trom flying out of the front end ofthe barrel when the tool is not held against. the work. 'l`o keep the rivet set or other tool l'roin dropping out of the implementwhen :he latter is not in use, a spring clip or other detachable, yieldable connection is employed between the, implement' and the tool,` but such clip or the like is not suflicient tov prevent they piston from being discharged from the implement in case the throttle valve of the implement is accidentally or maliciously opened at a time when the tool is not in contact with the rivet or other part being acted u on. Much damage and numerous :tatal injuries have been caused 1n the past by the lack of means -lor preventing `discharge of the pistons of pneumatic riveters and similar powerful implements.

This' .iuvrul ion contemplates the provision ot' elleclivc and durable means for preventing such discharge. l l

.ln the accompanying drawings, Figure 1 .is a, side elevation, partly in section, ot a pneumatic riveter embodying the features of my invention, showing the implement applied to the wm-ku. Fig. 2 isla fragmental sectional view to show how the pistou is restrained when the implement is removed A:trom the work. Fig. 3 is a ragmental view of an alternative construction.

Specification of Letters Patent. PatntcdiAllg. 1914. Appnca'aon inea November 11913;; srm No. 799,671. i i

latter consists of a head 5 and a cylindrical yshank 5", said shank beiner slidably mounted in a bore 6 in'the forwarc end of the im )lenient. The rivet set is prevented from 4alling out of the bore 6 by a springclip 7- in the form of a split rin or band that embraces the shank 5" of t e rivet set and lies loosely .within an annular internal groove 8 in the implement. The spring clip 7 grips` the rivet set hard enough to prevent the rivet set from ldro pino` out of the bore ti, while permitting tie rivet set to move `1n said bore under the impact of the piston. The clip is very simple in construction, and, being inclosed, is protected from. injury.

to reciprocate is of less iameter than the bore 6. 9 is'enlarged as usual, for the reception of the compressed air. At the junctureof the bores Gand 9, the bore 9 is tapered inwardly to form a conical or annular tapered wall 11, and the lforward portion 12 ofthe piston 4 is correspondingly tapered. The taper of the parts 11 and 12 may be straight, as shown in igsgl and 2, or curved, as indicated in Pig. f

18 is the reduced forward end of the piston, said reduced portion being of sufficient length to allo'w the piston to strike the tool, in the normal use of the implement, without bringing the surface 12 into Contact with the wall 11. l l

The bore 9 in which the iston is arranged A80 The forward portion of the bore In the event that the throttle lever 3 should be operated at a time when the rivet set is not in Contact with the work, the piston 4 will be prevented from shooting out of the implement by the engagement ot' the tapered portion 12 of the'piston with the correspondingly tapered wall 11 of the cyl v tool, `the barrel and the piston having oor' I respondingly taperedsurfaeesfcoacting to prevent the piston from from the barrel. l

2. A'pneumatic lmplement comprising a barrel `havingV a 'forward 'and' a rear bore, said boresl communicating with 'each other,y

a tool slidabiy mounted in the forward bore,

'and a piston mounted in therear bore, the

forward end ofthe rear bore being tapered `nward1y, and the forward portion of the piston being correspondingly tapered, the

from the barrei, 4. y

3. A pneumatlo lmplement comprising a 4barrel having a forward and a rear bore, saidbores communicating Witheach other,

" discharged l f Witnesses:

a tool havin a shank siidabiy' mourned the forward ore, a piston eiidabiy mounted inv therear bore, said pinion lese diameter than the shank of iie @ooh i, ward end portion o rire pist: 'i iosa; diameter than the body of forwardend portion being comme i piStQnbOdy by an annuiar tap-ered "porion` the forward end of the rear bore boing cor respondirigly'tapered to prevent the piston from being discharged from the barre In testimony whereof 1 aiiii; my signorine fio in presence `of two witnesses.

GOTTLiEi-B EB EEG Hifi,

ARTHUR GRAF,

G. P. Hinwilcorn.` 

